WPF DatePicker 显示 DateTime.Today OR 绑定
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WPF DatePicker show DateTime.Today OR Binding
提问by Wim Ombelets
What is the best way to have a WPF DatePickershow a predefined DateTime(e.g. DateTime.Today) while still maintaining binding?
在保持绑定的同时让 WPFDatePicker显示预定义DateTime（例如DateTime.Today）的最佳方法是什么？
SelectedDate="{x:Static sys:DateTime.Today}"
SelectedDate="{x:Static sys:DateTime.Today}"
and
和
Text="{Binding Path=MyPublicProperty.ADateTimeMemberProperty, Mode=TwoWay}"
Text="{Binding Path=MyPublicProperty.ADateTimeMemberProperty, Mode=TwoWay}"
don't play well together. When a UserControlis loaded, I'd like it to display today's date, until a row is selected. Is there a way to make them get along?
一起玩不好。当UserControl被加载，我想它显示今天的日期，直到选中一行。有没有办法让他们和睦相处？
回答by Bas
Text="{Binding Path=MyPublicProperty.ADateTimeMemberProperty,
Mode=TwoWay, FallbackValue={x:Static sys:DateTime.Today}}"
Use FallbackValue to set a value when it cannot be retrieved from the binding.
当无法从绑定中检索值时，使用 FallbackValue 设置值。
